在建筑结构设计中,结构构件的抗力R是结构材料强度f和几何参数a的函数,在现代安全度理论中,两者都按随机变量考虑。在设计中除材料强度外,有时还会涉及结构材料的其它力学性能,例如弹性模量、极限变形等,这些也应按随机变量考虑。在这一讲中,我们着重谈谈作为随机变量的结 In the structural design of buildings, the resistance R of structural members is a function of the strength f of the structural material and the geometrical parameter a. In modern safety theory, both are considered in terms of random variables. In addition to the strength of the material in the design, other mechanical properties of the structural material, such as elastic modulus, ultimate deformation, etc., are sometimes involved. These should also be considered in terms of random variables. In this lecture, we focus on the knot as a random variable